Unless its a mesh tent. or else it wont work
Without seeing the tent I can't say for sure, but if you are willing to make some modifications, you may be able to use it. At fabric stores and those Walmart stores that still sell fabric, you can purchase clear plastic (table cloth strength and sometimes heavier) on large rolls (4 to 5 feet wide), permanent fabric glue and (optional) Velcro. And at home repair stores you can purchase fabric screening.
It seems to me that you can turn it into a green house by: 1.) setting up the tent where you want the greenhouse to be, angling it for maximum sun penetration all day, staking it down well, and then marking one or more large wall areas that are no less than 4 inches from any seam, 2.) cutting the screening and clear plastic about 4 inches all around larger than the walls you marked, 3.) gluing the screen to the inside tent wall, 4.) carefully snipping/cutting out the tent wall, 5,) and then attaching the clear plastic to the outside of each wall.
On this last step, you can choose to: 1.) glue the clear plastic across the outside top of the wall and just let it hang there (if you aren't in a particularly windy or cold climate but are in a hot one where the plastic may need to be pulled open all the way or, if you glue it part of the way around you can pull up a corner for air circulation), or 2.) glue a Velcro strip around all of the outside edges of one side of the clear plastic, matching the other half of the Velcro strip to the tent and gluing that half of the Velcro strip to the tent. Now you can attach the clear plastic the same way you put any two pieces of Velcro together--zip it on (and off when need be). This second option will be more expensive, but will let you remove the clear plastic when its warm enough, and the screening fastened on the inside will let the light in but help to keep the bugs out.
Do as many walls (and even part of the roof) as you think necessary. If it still doesn't seem to have enough light, there are many low-light plants you should be able to grow in it. (Many herbs, like cilantro, broadleaf thyme, and others do well in low light.) Good luck!
I forgot to mention that, if you aren't adding grow boxes with soil but want to grow straight out of the ground, and your tent has a fabric bottom, you won't necessarily have to cut the bottom out of the tent. Instead, you can determine your plant layout (mark it right on the floor), and then cut X's into the tent floor. To plant a plant, open the X, dig out the ground, and then put your plant in. Let the pieces of the tent floor close around the plant. That helps keep the weeds down, but you'll need to make certain you do two things. First is to leave enough room for you to get to each plant, maybe an aisle down the center depending on the width of the tent. Second, water each plant, not the tent floor as it is designed to be waterproof. Your best bet might be drip irrigation directly to each X you cut. That you could customize, and they have systems you can connect to your hose to turn on when you want.
No, greenhouses need to be transparent, to let light in (jtobako has already alluded to this).L
Will the fabric let enough light threw to the plants inside? (Different fabrics, different answers...)